The alicloud_db_instances data source provides a collection of RDS instances available in Alibaba Cloud account.
Filters support regular expression for the instance name, searches by tags, and other filters which are listed below.

tags - (Optional) Query the instance bound to the tag. The format of the incoming value is json string, including TagKey and TagValue. TagKey cannot be null, and TagValue can be empty. Format example {"key1":"value1"}.